Brook



(No Model.) A

- C. W. F. -HOLBRO0K.

Y DENTAL MANpRB'L. No. 376,653.

Patented Jan. 17, v1888.

UNITED STATES PATENT OFFICE. v

cHARLEs W. E. HoLRRooK, or NEWARK, NEW JERSEY;

DENTAL MANDREL.

SPECIFICATION forming part o1' Letters Patent No. 376,653, dated January 17, 188.8.

Apptitann fna october 4,1887.

To aZZ whom it may concern;

Be it known that "I, CHARLES W. F. HOL- EROOK, a citizen of the United States, residing at Newark, in 'the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Dental DiskCarriers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains. to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of "referencemarke'd thereon, whichforni a part of this specification.

My invention relates to disk-carrying mandrels, and provides means for securelyattaching emery-disks to mandrels, such as are used in dentistry and in the arts.

vMy invention relates more particularly to that `class of clutches in which a head-piece is forced onto the disk to be rotated; but as such mandrel-clutches are composed of a number of detached pieces, which in practice are often mislaid and cause annoyance by their loss, I have constructed a device all the parts of which are connected together, and therefore not liable to be lost.

In the accompanying drawings,forming part of this application, Figure 1 is an outside view of my invention. Fig. 2 isa View in section. Fig. 3 represents the disk with a -centrally-located opening. Fig. 4 shows the head of the clutch. Fig. 5 shows the head of the sleeve. Fig. 6 is the side view of the clutch in position to adjust the disk. Fig. 7 is an end view of Fig..6, with disk adjusted; and Fig. 8 is a plan view of clutch and disk ready for use.

A represents the spindle having a crosshead, a, of oblong form, riveted upon the end, and the shoulder a. v,

B represents the disk adapted to be carried by the mandrel, having a central opening, b, of rectangular form and of such a sizeas to receive the head of the spindle.

C represents the coiled spring which surrounds the mandrel.' Y

D represents the sleeve constructed with two teeth, d d.

In constructing the clutch the coiled spring is placed on the spindle extending from the Serial No. 25l,485. (No model.)

shoulder a to the head a. The sleeve D is slipped over the spring, the' aperture d' beingl of only slightly larger diameterthan the end of the spindle, the other end fitting loosely over the shoulder c. eted, soldered, or otherwise permanently attached to the end of the spindle, and the device is complete. Y i Y It will be readily noticed vthat the sleeve is capable of rotating only after being pressed downward in such a manner that the teeth will become disengaged -from the head a. pressure of the spring being continually upward, the teeth ofthe sleeve will be forced upward as far as the head allows when in the posi# tion shown in Fig. l, and when the sleeve is pressed downward and rotated one-,quarter revolution the teeth d d will be under the head a, and will present the appearance shown in Figs. 4, 5, and 6. If a disk of emery-paperhav- Yinga central opening of a size to correspondto The head a is now riv' The f that of the head abe now placed over the said y with it, and the downward pressure removed,

the teeth d d will rise through the aperture in the disk ou each side of the head a and iirml hold the disk while being rotated.

Having how fully described my said invention, what I claim, and desire to protect by Letters Patent, is-.-

l. In a dental diskcarrier, the combination vof ya spindle -provided with a crosshead, a

Ysleeve having teethon its end, and an outwardly-pressing spring, whereby the said teeth engaging a disk placed on the carrier will holdy which the cross-head fits, locking, the-disk in position. V

In testimony whereof I afELX my signature in presence of two witnesses. i

CHARLES W. F. HOLBROOK. Witnesses:

THos. E. WOOD, B. F. GILBERT. 

